Ultra Light Boson Dark Matter and Event Horizon Telescope Observations of M87*

Abstract

The initial data from the Event Horizon Telescope (EHT) on M87${}^{\ast }$, the supermassive black hole at the center of the M87 galaxy, provide direct observational information on its mass, spin, and accretion disk properties. A combination of the EHT data and other constraints provide evidence that M87${}^{\ast }$ has a mass $\sim 6.5\times 10^9{M}_{\odot }$ and dimensionless spin parameter $|a^{\ast }|\gtrsim 0.5$. These determinations disfavor ultra light bosons of mass ${\mu }_b\sim 10^{-21}$ eV, within the range considered for fuzzy dark matter, invoked to explain dark matter distribution on $\sim$ kpc scales. Future observations of M87${}^{\ast }$ could be expected to strengthen our conclusions.

4 pages, 2 figures

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